/*

analog 2 pwm

PB0  pwm channel 1
PB1  pwm channel 2
PB2
PB3  Analog 2 in
PB4  Analog 1 in
PB5 (RESET)

CODE BY RUE_MOHR!

*/
#include <avr/io.h>
#include <avr/interrupt.h>
#include "avrcommon.h"

#define OUTPUT  1
#define INPUT   0


 void PWMInit ( void );
 void Init_ADC( void );


 volatile unsigned int AdcValues[2];
 volatile unsigned char flag;

int main( void ) {



  // Set clock prescaler: 0 gives full 4.8 MHz from internal oscillator.
  CLKPR = (1 << CLKPCE);
  CLKPR = 0;

  DDRB = ((OUTPUT << PB0) | (OUTPUT << PB1) |(INPUT << PB2) |(INPUT << PB3) |(INPUT << PB4) |(INPUT << PB5 ));

  PWMInit();
  Init_ADC();

  flag = 0;
  sei();

  while(1)  {
   NOP();
  }

}

//---------------------------------------------------------------------------



void Init_ADC( void ) {
  // VCC voltager ref, ADC2 (PB4) as default input
  ADMUX = 2| (1<<ADLAR);
  // Enable ADC, ADC prescaler /32
  ADCSRA = (1<<ADEN) | (1<<ADPS2) | (1<<ADPS0) | (1<<ADIE);

  // Start conversion and wait for it to complete (result not used)
  ADCSRA |= (1<<ADSC);            // Start convertion

}

ISR(ADC_vect) {
  char i;
  unsigned char v;

  i = ADMUX & 1;       // what channel we on?

  v = ADCH;
  if (v > 0xF7) v = 0xFF;
  if (v < 0x07) v = 0x00;

  if (i == 0) OCR0A = v;  // save value
  else        OCR0B = v;

  ADMUX = ((1 - i) + 2) | (1<<ADLAR);       // select channel

  ADCSRA |= _BV(ADSC); // start next conversion

  flag = 1;

  return;
}


void PWMInit() {
  // clear pwm levels
  OCR0A = 0;
  OCR0B = 0;

  // set up WGM, clock, and mode for timer 0
  TCCR0A = 1 << COM0A1 |
           0 << COM0A0 |
           1 << COM0B1 |
           0 << COM0B0 |
           1 << WGM00  |
           1 << WGM01  ;

  // set up WGM, clock, and mode for timer 2
  TCCR0B = 0 << CS02  |
           1 << CS01  |
           1 << CS00  ;

 }